I recently looked at this page using IE9 and found that all the info windows with 3 years in their content wrap the third year onto a second line and have a vertical scroll bar. On the page above, I have temporarily replaced one of my usual “3” placemarkers with a pin placemarker so you can readily see the issue but you’ll see the same scroll bar effect in the info window if you click on any other “3” placemarker on the map. On the other hand, for example, info windows for “4” placemarkers are fine – all 4 years are on the same line.

The scroll bar behaviour does not occur in IE8, Firefox, Opera or Chrome.

Your theme is applying the new CSS3 word-wrap property, which may be the source of the problem. It looks like it’s fully supported by IE9 (except for using the legacy name), but most themes don’t use it, so it wouldn’t surprise if that were the problem.

You can also open IE9’s Developer Tools to inspect the .bgmp_placemark elements. Look for differences in the between a .bgpm_placemark div with 3 years and the others. You can also try switching the document mode to IE8 and seeing if you can spot any differences between it and IE9.

By the way, I’m sorry I haven’t got back to you about the problem I described in this thread – I really do appreciate your advice. I tried the code you suggested but it didn’t resolve the issue. I also found that it was a broader problem than just the “3” placemarks eg “9” placemarks are also affected in IE9. I need to find some time to have another go at isolating what is causing the issue.